After his barefoot walk around Boston, the 22-year-old singer went on an Instagram rant on Tuesday, continuing to air his frustrations with fans who come up to ask him for photos on the street.

"If you happen to see me out somewhere know that I’m not gonna take a picture. I’m done taking pictures," the "Purpose" artist wrote. "It has gotten to the point that people won’t even say hi to me or recognize me as a human. I feel like a zoo animal, and I wanna be able to to keep my sanity."

"I realize people will be disappointed, but I don't owe anybody a picture," he concluded. "And people who say, 'But I bought ur album,' know that you got my album and you got what you paid for… AN ALBUM! It doesn’t say in fine print whenever you see me you also get a photo."

Bieber is in Boston for two Purpose Tour shows, and while he didn't stop for photos, many fans snapped pics of their chance encounter with the barefoot celebrity.

The singer's exhaustion with publicly meeting fans began in March, when the singer canceled scheduled meet and greets, saying that they left him feeling "drained and unhappy."

"[I] want to make people smile and happy but not at my expense and I always leave feeling mentally and emotionally exhausted to the point of depression," he wrote. "Can't tell you how sorry I am, and wish it wasn't so hard on me."